I want to perform a comparison of multiple implementations of basically the same algorithm, written in Java, C++ and Python, the latter executed using Pypy, Jython and CPython on a Mac OS X 10.6.4 Macbook Pro with normal (non-SSD) HDD. It's a "decode a stream of data from a file" type of algorithm, where the relevant measurement is tota...
Hello In C++ you can do the following: int x = 5 cout << x; // prints 5 int* px = &x; (*px)++; cout <<x; // prints 6 Is there an equivalent construct in Java ...
I am facing trouble in doing password validation. I am taking the min and max value for the range of password from the java class called applicationconstants and calling that in the servlets. I am using the validation function in another java class and calling that in servlet. Please help me in solving this problem. servlet code int mi...
Hello, I have a piece of code that 'updates' an entry in the database by first cascade deleting it, and then replacing it with a new object, because I had a lot of problems trying to update it normally. This hack worked fine, until I started using some ManyToMany relations. This is the relation that is giving problems: @ManyToMany(casca...
..where do you begin? As a basis for any design - for instance a package - where do you as a developer start. I start by mapping out the requirements and breaking them down into sub categories and from this objects and methods. Usually takes a while before I start drawing it out by hand - then that goes through a few versions. But I a...
Given an input String, what is the most efficient way to make just the first character lower case? I can think of a number of ways to do this. For example, using charAt and subString: String string= "SomeInputString"; string = Character.toLowerCase( string.charAt(0)) + (string.length() > 1 ? string.substring(1) : ""); Or using a ch...
I am still learning about using Future and Callable in Java. Stumble into this question: Say I have class: TaskWorker implements Callable { public String id; public TaskWorker(String id) { this.id = id; } public Documents call() trows Exception { //Assume here, that Search and Doc are my own method to search and re...
This is my persistence.xml: <persistence> <persistence-unit name="MyUnit"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <jta-data-source>jdbc/abcDS</jta-data-source> </persistence-unit> </persistence> This is jndi.properties file from src/test/resources which is supposed to create a datasource during testing...
I'm using TinyMCE ( http://tinymce.moxiecode.com/index.php ) as an editor on a webproject running on a Java-platform (Tomcat, Spring) There's a filemanager on the webpage for TinyMCE: http://tinymce.moxiecode.com/plugins_filemanager.php But as stated on that page: "The MCFileManager is a online file management utility, available as PHP...
I need a good spell checker library for Java that can spell check a JTextArea (or any JTextComponent) in real time. That is, it should have a wavy red underline appear under text while the user is typing. It needs to be able to list all the available word replacements by left clicking (yes, left clicking) the word. If not possible, ri...
My team are putting together a proof-of-concept Flex application sitting on top of a Spring-based server using BlazeDS. We do quite a lot of date calculations, so we use Joda Time extensively throughout the code and in our domain model. We're now trying to figure out how we can continue to use Joda Time in our DTOs that are sent back-a...
I need to store authentication credentials for legacy systems in a J2EE container (IBM WebSphere Application Server Network Deployment 6.1). These legacy systems are accessed using an HTTP interface, but it's not a Web Service. The idea is to query these credentials using JNDI (or some other mechanism) and then use it to authenticate in ...
Not sure if the title captures what I'm trying to say here. When designing in OO should I be splitting my objects up into their most specific areas - so if I have a factory object that deals with creating objects but later on i come across a way of creating objects for another purpose even though they may be the same objects is it worth...
I am learning Swing and wrote an app that lets user select an image file and displays it on a JPanel. It works, but I want to handle situations when user doesn't select any file user selects a non image file In these cases I want to clear the JPanel and show an error message on a text area. I tried to do this as below.But I am not s...
I have a hibernate query which returns 10s of thousands of object results. Is it possible to cycle through chunks of the query rather than handling the entire query at once? Sample code: Query q = session.createQuery("FROM Class"); List<Class> classList = (List<Class>) q.list(); Thanks ...
I've included all jars the application requires, I'm trying to use Jetty Embedded I have a simple java class with a main method that has the following setup, servlets still work correctly just can't get JSP's to work. All required jars are included, started with basic Jetty jars then added all from the jsp folder. Server server = new ...
A) If I have a java application which starts up and waits for socket connections on a specified port. Is there a way i could maintain a session connection in php after a user validates, i.e a persistent connection? B) I mean, I'm trying to understand how its done with mysql and php. How does mysql or php know what the last opened connec...
Hi guys, my company runs a site that primarily has its backend logic coded in Perl. It works fine but ultimately we are headed to something Java driven. I do plan on studying this and would like to start setting up a Java environment on another server in our company so when the time comes I at least have a headstart. Does anyone have a r...
hello, i have a several launch configurations in eclipse each launching the same java-program but with different parameters. now is it possible to run all of these at once (with one mouseclick) instead of selecting each of it seperately and launching it? thanks! ...
JTable cells by default are in append mode when the cell is double clicked on. Is there a way to make the cell default to overwrite mode instead, IOW, select the contents of the cell so that if the user started typing the old text would be replaced by the new text without having to manually erase it? ...